"""
生成 spread 数据图表（HTML）。
用法: python3 chart.py
"""
import sqlite3
import json
DB_PATH = "/Users/vipg/Documents/futures-data-warehouse/db/futures.db"
def main():
conn = sqlite3.connect(DB_PATH)
rows = conn.execute(
"SELECT trade_date, spread, main_chg FROM spread ORDER BY trade_date"
).fetchall()
conn.close()
dates = [r[0] for r in rows]
spreads = [r[1] for r in rows]
chgs = [r[2] if r[2] is not None else None for r in rows]
html = f"""
玻璃期货 spread 走势
玻璃期货 — 合约链差价 & 主力合约日内涨跌
"""
out_path = "/Users/vipg/Documents/futures-data-warehouse/chart.html"
with open(out_path, "w") as f:
f.write(html)
print(f"已生成: {out_path}")
if __name__ == "__main__":
main()